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1.
本文对塔里木盆地北缘阿克苏地区磷矿沟震旦系剖面进行了详细的沉积体系研究。结果表明,该剖面主要发育滨岸沉积体系、碎屑岩潮坪沉积体系和碳酸盐潮坪沉积体系,这几种沉积体系的组合反映了震旦纪阿克苏地区由碎屑岩体系向碳酸盐岩体系的演化过程。在野外露头中共识别出4种不同类型的层序界面:(1)海侵上超层序不整合界面;(2)水进侵蚀冲刷面;(3)岩性、岩相转换面;(4)暴露溶蚀面。在识别出层序界面的基础上对震旦系划分出2个二级层序和5个三级层序。第一超层序SS1包含3个三级层序:SQ1、SQ2和SQ3。第二超层序SS2包含2个三级层序组:SQ4和SQ5。 相似文献
2.
笔者建立了中扬子区寒武系层序地层格架，研究了中扬子区层序界面和体系域特点，分析了中扬子区层序样式的基本类型及其特征。共划分出2个二级层序、14个三级层序。寒武系下统划分了1个二级层序(SS3)、6个三级层序(SQ1—SQ6)，平均延时约5．0Ma；体系域颜色普遍较深，泥质含量较高，是一套良好的烃源岩。寒武系中上统划分出1个二级层序(SS4)、8个三级层序(SQ7—SQ14)，平均延时约2．9Ma；体系域颜色普遍较浅，云质含量较高，是一套良好的储集层。总体上H型样式为主，T型样式和TH型样式数量相当，反映寒武纪水体中等。二级层序体系域和三级层序体系域都表现出明显的南北向差异性。 相似文献
3.
华南上泥盆统和下石炭统层序地层学 总被引：9，自引：0，他引：9
本文把华南法门阶上部和杜内阶分为４个层序，自下而上依次命名为ＳＱ０、ＳＱ１、ＳＱ２和ＳＱ３。其中ＳＱ０属斯图年阶（Ｓｔｒｕｎｉａｎ）（泥盆系最顶部），其余３个层序归杜内阶。这４个层序可以与欧美等地同期的层序进行对比，表明当时的海平面升降变化及其由此而产生的沉积层序具有全球的一致性。层序地层学、生物地层学和事件地层学综合研究表明，华南浅海相区与Ｓｉｐｈｏｎｏｄｅｌａｐｒａｅｓｕｌｃａｔａ－Ｓ．ｓｕｌｃａｔａ界线一致的泥盆－石炭系界线不仅高于Ｃｙｓｔｏｐｈｒｅｎｔｉｓ带顶界，而且还应高于引起Ｃｙｓｔｏｐｈｒｅｎｔｉｓ绝灭的海退事件层的顶界。因此建议以Ｃｙｓｔｏｐｈｒｅｎｔｉｓ－Ｐｓｅｕｄｏｕｒａｌｉｎａ间隔带中最明显的一个海进面，即ＳＱ１的海进体系域的底界作为华南浅海相区泥盆－石炭系界线。这条界线与泥盆－石炭纪之交海退事件层的顶界正好一致，大致相当于Ｐｓｅｕｄｏｕｒａｌｉｎａ组合带底部。 相似文献
4.
SequencestratigraphyhashopaidmoreattentionforitSrelativelycompletetheoreticalsyStemandgreatsuchesinpracticesinceitwasadvancedinthe197ds.Integratingonthedataofbiostratiglaphy,lithostratigraphy,seismicstfstigraphy,geochendstryandsedirnentology,sequencestratigraphyattemptStoestablishachronostratigraphicframeworkandcormectsdepositionalsequencewithglobalsealevelchange,andhencemakeSitpossibletOpreciselycorrelatethestrataindifferentfactesareasoveraconsiderabledistance,evenovertheworld.TheUpperDevon… 相似文献
5.
Mahnaz SABBAGH BAJESTANI Asadollah MAHBOUBI Reza MOUSSAVI-HARAMI Ihsan AL-AASM Mehdi NADJAFI 《《地质学报》英文版》2017,91(5):1797-1819
The study area is located in the east Tabas Block in Central Iran. Facies analysis of the Qal’eh Dokhtar Formation (middle Callovian to late Oxfordian) was carried out on two stratigraphic sections and applied to depositional environment and sequence stratigraphy interpretation. This formation conformably overlies and underlies the marly-silty Baghamshah and the calcareous Esfandiar formations, respectively. Lateral and vertical facies changes documents low- to high energy environments, including tidal-flat, beach to intertidal, lagoon, barrier, and open-marine. According to these facies associations and absence of resedimentation deposits a depositional model of a mixed carbonate–siliciclastic ramp was proposed for the Qal’eh Dokhtar Formation. Seven third-order depositional sequences were identified in each two measured stratigraphic sections. Transgressive systems tracts (TSTs) show deepening upward trends, i.e. shallow water beach to intertidal and lagoonal facies, while highstand systems tracts (HST) show shallowing upward trends in which deep water facies are overlain by shallow water facies. All sequence boundaries (except at the base of the stratigraphic column) are of the no erosional (SB2) types. We conclude eustatic rather than tectonic factors played a dominant role in controlling carbonate depositional environments in the study area. 相似文献
6.
陆相断陷盆地低凸起斜坡带层序划分及其沉积充填演化特征:以埕岛东斜坡古近系为例 总被引：2，自引：2，他引：0
层序分级不一致和井震层序不统一都会导致沉积充填演化特征反映的不准确,将制约储盖组合与油气分布的预测。文中应用沉积层序的概念,利用岩心、岩性、测井与地震资料,以层序界面与内部构成特征相结合的原则,从坡下到坡上,对东斜坡古近系进行了层序划分。一级层序相当于系地层单元,与构造运动相对应,层序界面为区域性角度不整合;二级层序相当于统或组地层单元,与构造运动幕相对应,层序界面为局部不整合;三级层序相当于段或亚段地层单元,与构造幕内的次级构造作用相对应,层序界面为超覆不整合面、沉积体系转换面及重力流下切面;四级层序即体系域,相当于油组与砂组,与三级层序基准面旋回的阶段性变化相对应,层序界面为初始洪泛面、最大洪泛面,共识别出SQ1、SQ2、SQ3、SQ4、SQ5和SQ6等6个三级层序及15个体系域。井震统一的层序格架结合了钻井资料纵向高分辨率与地震资料横向好连续性的优点,从而高精度、高分辨率地揭示了层序格架充填演化特征,体现出层序旋回性与体系域及平面沉积相分布的差异性。古近纪埕岛凸起夷平,斜坡及凹陷补齐,发育超覆、披覆沉积;古地形由南低北高向南高北低转换;本地物源、邻近物源、区域物源阶段性变迁;多物源的沉积体系交叉、叠置,沉积相发生了扇三角洲-浊积扇-半深湖-滑塌浊积扇-辫状河三角洲-曲流河泛滥平原演变。埕岛低凸起斜坡带层序及沉积充填演化特征具有陆相断陷盆地的代表性,因而,此项研究对于解决层序地层学面临的工业化应用研究不足的问题以及油气储盖组合预测方面的难点可提供有益参考。 相似文献
7.
如何利用有限的烃源岩样品的实验分析数据和地质资料尽可能地提高烃源岩评价和预测的精度,是当今烃源岩地球化学研究亟需解决的问题.采用层序地层学与油气地球化学相结合的方法,研究了非洲尼日尔Termit盆地基于层序地层格架下,上白垩统Yogou组烃源岩空间分布特征及有机质地球化学性质,初步展示了层序地层格架下烃源岩地球化学研究的方法、应用效果及优势.Termit盆地上白垩统Yogou组海相泥页岩是该盆地主要的烃源层,自下而上可划分为YSQ1、YSQ2和YSQ3共3个三级层序.根据层序/体系域发育特征、岩性录井和测井曲线响应特征,识别出外陆棚、内陆棚、三角洲、滨岸相泥岩及煤/炭质泥岩共5种不同沉积类型的烃源岩,不同层序与体系域具有不同的烃源岩纵向叠置关系和横向分布特征.不同类型的烃源岩有机质具有明显不同的地球化学性质:外陆棚和内陆棚泥岩有机质丰度中等-好,有机质生物来源中,低等水生生物贡献高,沉积于偏还原的沉积环境.滨岸和三角洲相泥岩有机质丰度高,具有低等水生生物和高等植物来源的双重贡献,沉积于偏氧化的沉积环境.三级层序或其体系域控制下的沉积相分布和演化导致不同类型烃源岩的发育和横向分布特征,同一沉积相类型的烃源岩具有相似的地球化学性质.与传统的以组、段为单元的烃源岩地球化学研究相比,层序地层格架下的烃源岩评价可以刻画不同层序、不同体系域和沉积相带烃源岩有机质地球化学性质的差异,提高资源评价和油-源对比的精度. 相似文献
8.
通过沉积相和高频层序地层分析,确定川东地区下三叠统嘉陵江组主要为蒸发台地和局限台地沉积环境,可划分出SQ1、SQ2二个三级层序及SSQ1-SSQ5五个四级层序,经历了从局限台地→蒸发台地→局限台地→蒸发台地的沉积演化过程,主力储、产层发育于SSQ1和SSQ2层序,此五个四级层序主要由TST和HST两个体系域组成。以四级层序为编图单元,编制了SSQ1-SSQ5各四级层序的岩相古地理图和探讨了有利储集相带展布规律,认为SSQ1和SSQ2二个四级层序叠置发育的局限台地—台内浅滩为最有利的储层发育相带,应成为今后的勘探重点。 相似文献
9.
应用露头层序地层的原理和方法,对四川石棉田湾矿区以碳酸盐岩为主的上震旦统进行了研究,识别出４个３级层序,描述了各层序的特征,探讨了该区晚震旦世海平面的变化规律和层序地层中体系域与金等贵金属矿床的关系。 相似文献
10.
Antonio Sim 《Tectonophysics》1986,129(1-4)
The Upper Cretaceous (Cenomanian-Maastrichtian) of the south-central Pyrenees shows five carbonate platform sequences where the major parameters are tectonism, relative sea-level fluctuations and inherited depositional profile. Depositional geometries and basin analysis permit an understanding of the depositional history.Five depositional sequences have been recognized: (1) The Santa Fe sequence (Middle-Upper Cenomanian), a ramp to a skeletal rimmed shelf with an escarpment bypass margin. The lower boundary is an angular unconformity and the upper one records a sea-level drop. The platform location of the margin was determined by a listric normal fault. (2) An abrupt sea-level rise drowned the former platform. The Congost sequence (Turonian-Lower Coniacian), a distally steepened ramp with erosional distal deep slope. The depositional model was largely controlled by pre-existing basin morphology. Cessation of platform development was due to a relative sea-level drop. (3) The Sant Corneli sequence (Upper Coniacian-Lower Santonian), a mixed terrigenous-skeletal homoclinal ramp with upright margin, deep slope and dysaerobic basin. The slope results from the backstepping by 24 km of the previous margin and gentle basin tilting. The platform margin remained more or less at the same position, and relief between platform and slope increased indicating continuous relative sea-level rise. The upper boundary is an angular unconformity at the platform margin produced by an abrupt sea-level rise and platform drowning, and by listric normal faulting. (4) The Vallcarga sequence (Upper Santonian-Campanian), a distal-steepened skeletal homoclinal ramp, erosional escarpment and turbidite basin, which corresponds to the Mesozoic maximum marine expansion. A listric normal fault created two depositional areas: a more or less flat footwall block with a north-northwest prograding carbonate ramp. 相似文献
11.
通过对各类层序界面的识别，以沉积特征、副层序和体系域与结构转换面等层序分析，进行露头层序地层学研究，将湘西北慈利—大庸地区台缘斜坡相区上震旦统—下寒武统划分为11个Ⅲ级层序，其中上震旦统7个、下寒武统4个，主要是Ⅱ型层序。在区域层序地层对比、分析的基础上初步讨论了露头层序地层分析中存在的问题。 相似文献
12.
S. Fu Y.-Z. Li Y.-R. Guo X.-M. Xu J.-J. Liu 《Australian Journal of Earth Sciences》2018,65(6):823-850
The third-order sequences of the Yanchang Formation in the Ordos Basin were determined by a comprehensive analysis of surface outcrops, core, logging and seismic data. Natural gamma curves were studied by the band-pass method. The hidden stratigraphic sequence and six lithological cycles were extracted. By examining sequence boundaries and lithological cycles, we identified six third-order (including SQ1, SQ2, SQ3, SQ4, SQ5 and SQ6) and three second-order sequences in the Yanchang Formation. The sequence stratigraphy of the Ordos Basin was found to have the following special development characteristics: (1) the third-order sequence growths were totally stable, and the thickness of the Ordos Basin was relatively stable; (2) thick sand bodies did not form in lowstand systems because of underdeveloped slope breaks; (3) the third-order sequences had diverse features at different sedimentary periods; (4) the distribution of the depositional systems had various characteristics in different tectonic belts, and the entire sequence had the filling characteristics of multiprovenances and multicycles. The low-accommodation Ordos Basin in the Upper Triassic was limited by slow subsidence, gentle basement paleorelief, stable tectonic settings and sufficient sediment supply. The characteristics of the basin included stable developed sequences, limited preserved lowstand systems tracts, multiple depocentres and subsiding centres, development of many delta systems in the north and south of the basin controlled by the gradient of the basement paleorelief, and laterally stretching sediments. Results further indicated that the controlling factors of the third-order stratigraphic sequences of Yanchang Formation in the low-accommodation lacustrine Ordos Basin included sediment supply (provenance), climate and lake-level fluctuation. Overall, our case study indicated that the development characteristics and controlling factors of sequence stratigraphy in a low-accommodation lake basin provided a comprehensive method of establishing the sequence stratigraphic framework of a low-accommodation non-marine basin. Our results also predicted that the SQ3, SQ4 and SQ5 of the Qiaochuan and Zhidan areas favoured oil and gas prospecting of the Yanchang Formation. 相似文献
13.
黄仕华 《沉积与特提斯地质》2000,20(2)
义敦地区处于活动岛弧带 ,1:5万区调将原图姆沟组自下而上分解为党恩组、列衣组、曲嘎寺组和勉戈组。以曲嘎寺组底部的I型不整合面及勉戈组底部的II型不整合面为基准 ,结合内部沉积组合特征 ,尝试划分出 3套三级层序地层 ,即下部层序 (未见底 )、中部I型碳酸盐层序和上部II型层序 (包括喇嘛垭组 ) ,在这些层序内各体系域发育齐全 ,特征明显。 相似文献
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15.
IDOIA ROSALES PEDRO ANGEL FERNÁNDEZ-MENDIOLA JOAQUÍN GARCÍA-MONDÉJAR 《Sedimentology》1994,41(5):861-882
The Aptian to lowermost Albian carbonate platform of Castro Urdiales (Cantabria, northern Spain) was broken up by extensional tectonic movements shortly after the beginning of the Albian. Block faulting characterized this rifting episode, the effects of which waned during the Albian. In crestal locations tilting of the fault blocks caused the subaerial exposure of parts of the older platform, resulting in intense karst diagenesis. Differential subsidence of the blocks controlled the development of a crestal residual carbonate platform (Arenillas), which was surrounded by deeper water on both sides. Seven unconformities related to platform exposure and karstification are identified on the Arenillas platform, and form the basal boundaries of seven depositional sequences (S1-S7). On the platform, lowstand systems tract deposits consist of breccias filling caves, and grainstones and debris flow deposits filling incised canyons. Transgressive plus highstand systems tracts consist of rare marls plus shallow water rudistid, coral and chondrodontid limestones. In the basin, the unconformities are erosional surfaces at the base of resedimented limestones, marls or sandy or silty siliciclastics (lowstand systems tracts). Transgressive plus highstand systems tracts in this setting consist of marls and hemipelagic marly limestones. Tectonism is believed to be the main control on sequence formation, and only a few sequence boundaries (e.g. the base of S6 in the Upper Albian inflatum Zone) can be correlated with eustatic events. 相似文献
16.
The Serra da Serpentina and the Serra de São José groups are two distinct banded iron formation-bearing metasedimentary sequences along the eastern border of the southern Espinhaço Range that were deposited on the boundary between the Orosirian and Statherian periods.The Serra da Serpentina Group (SSG) has an Orosirian maximum depositional age (youngest detrital zircon grain age = 1990 ± 16 Ma) and consists of fine clastic metasediments at the base and chemical sediments, including banded iron formations (BIFs), on the top, corresponding to the Meloso and Serra do Sapo formations, respectively, and correlating with the pre-Espinhaço Costa Sena Group. The SSG represents sedimentary deposition on an epicontinental-epeiric, slow downwarping sag basin with little tectonic activity.The younger Serra de São José Group (SJG) is separated from the older SSG by an erosional unconformity and was deposited in a tectonically active continental rift-basin in the early stages of the opening of the Espinhaço Trough. The Serra do São José sediments stretch along the north-south axis of the rift and comprise a complete cycle of transgressive sedimentary deposits, which were subdivided, from base to top, into the Lapão, Itapanhoacanga, Jacém and Canjica formations. The Itapanhoacanga Formation has a maximum depositional age of 1666 ± 32 Ma (Statherian), which coincides with the maximum depositional age (i.e., 1683 ± 11 Ma) of the São João da Chapada Formation, one of the Espinhaço Supergroup's basal units. The Serra de São José Rift and the Espinhaço Rift likely represent the same system, with basal units that are facies variations of the same sequence.The supracrustal rocks have undergone two stages of deformation during the west-verging Brasiliano orogeny that affected the eastern margin of the São Francisco Craton and generated a regional-scale, foreland N–S trending fold-thrust belt, which partially involved the crystalline basement. Thrust faults have segmented the terrain into a large number of tectonic blocks, where the stratigraphic sequence was nevertheless well preserved. 相似文献
17.
塔里木西部古生代层序地层特征 总被引：9，自引：3，他引：6
塔里木西部在古生代地质演化过程中,由于构造活动、海平面升降变化、沉积物供应速率等因素变化,造成了不同形式和不同级别的沉积间断,其产物---不整合面是建立该区层序地层格架的关键。研究区古生代大体经历了(寒武-奥陶纪)海进→(志留-泥盆纪)海退)→(石炭纪)海进→(二叠纪)海退的沉积旋回,形成了特征各异的层序序列。研究表明,其中Ⅰ级不整合面(层序面)有前震旦系顶界面、奥陶系顶界面和古生界顶界面。根据地面剖面、钻井和地震资料以及不整合面的特征和级别,首次在古生界识别出2个Ⅰ级层序、6个Ⅱ级层序和12个Ⅲ级层序。Ⅰ级层序是在不同的构造背景和沉积条件下形成的。Ⅱ级层序尽管特征各异,但一般均有四种基本叠置方式组成,即退积、进积、加积和上超。Ⅲ级层序一般由层序界面、海侵面和最大海泛面所限定的体系域组成,均发育TST和HST,有时出现SMST和LST。不同的体系域和沉积相控制着烃类生储盖层的分布,TST与生油层和储集层的形成有关,而HST多与盖层和储集层的形成有关。 相似文献
18.
通过对珠江口盆地恩平凹陷文昌组成湖条件、钻井岩心、油源对比和地震反射特征的综合分析,推断其满足发育大规模中-深湖相烃源岩条件,进而类比珠江口盆地已证实富烃洼陷(PY4洼、LF13洼)文昌组中-深湖相烃源岩地震反射特征(低频强振幅连续反射与席状弱振幅-空白反射),揭示研究区中-深湖相烃源岩空间展布规律及其发育模式.研究结果表明:研究区烃源岩具有低频强振幅连续反射特征和席状弱振幅-空白反射两种地震相特征.低频强振幅连续反射特征的烃源岩,其3级层序均有发育,恩平17洼中平面上主要集中于其中部及西部,上文昌组较下文昌组烃源岩沉积范围小且沉积中心向控凹断层F1侧迁移;恩平18洼中平面上主要位于18洼中部靠控洼断层F2断层一侧,上文昌组较下文昌组烃源岩沉积范围大,沉积中心没有明显迁移.席状弱振幅-空白反射特征的烃源岩,以SQ3~SQ5层序发育为主,恩平17洼中平面上局限于洼陷内部低隆起南部小型负向构造单元中;恩平18洼中平面上位于洼陷深洼带中.研究区发育3种中-深湖相烃源岩发育模式:(1)烃源岩主要发育在湖侵体系域和高位体系域;(2)恩平17洼上文昌组早期SQ5层序,对应烃源岩在低位体系域发育;(3)恩平17洼中低隆起南部的烃源岩发育,受小型负向构造单元控制. 相似文献
19.
在层序地层学和沉积学理论指导下,以油气勘探为目标,根据岩芯观察、岩石薄片鉴定分析、测井资料、地震资料,确定珠江口盆地（东部）珠江组主要发育：（1）碎屑岩沉积体系一三角洲、滨岸和浅海相;（2）碳酸盐岩沉积体系一开阔台地、台地边缘及台地前缘斜坡相。通过暴露标志、岩性岩相组合、生物组合及测井为主的层序界面识别,将珠江组划分为4个三级层序。在此基础上,对珠江口盆地（东部）珠江组取三级层序体系域或三级层序为成图单元,进行层序岩相古地理编图,详细探讨了珠江口盆地（东部）珠江组古地理特征及演化。结合各相带储集物性特征,认为珠江组SQ1-HST、SQ2-HST及SQ3晚期形成的台缘、台内礁滩沉积是寻找有利储集层的重要储集相带。 相似文献
20.
Paleotectonic Setting of Dongyan Group of Middle and Upper Proterozoic in Central Fujian Province 总被引：2，自引：0，他引：2
ZhangDaWuGanguo WuGanguo YeYujiang ZhangXiangxin WuJianshe WangQunfeng 《中国地质大学学报(英文版)》2004,15(1):29-35
The central Fujian Province, situated on the juncture of paleo-uplift of Wuyishan, Yongmei Late Paleozoic depression and the eastern volcanic rift-fanlting zone, is mainly composed of the outcropped metamorphic basements in the Middle-Late and Early Proterozoic, which constitute two upper and lower giant thick formations of Precambrian volcanic-sedimentary cycles, respectively. The formation of Dongyan Group is an important Middle-Upper Proterozoic component, and the Dongyan Group is directly related to massive sulfide deposit in this area. In recent years, plenty of lead, zinc, copper, silver and gold deposits have been found and explored. The Precambrian paleorift setting of the central Fujian Province served as a favorite metallogenic background for the formation of large- and superlargescale volcanic massive sulfide (VMS) lead and zinc polymetal deposits. The Dongyan Group consists chiefly of a set of ancient volcanic sedimentary formations that are composed mainly of greenschist. Its major lithologic types comprise greenschist, marble, quartzite and granofels class including various components. The metamorphic rocks of Dongyan Group are the main composition of Middle and Upper Proterozoic volcanic-sedimentary cycle. The original rock of Dongyan Group, a stable rock association, is volcanic sedimentation and normal marine sedimentation. But the original volcanic rocks, basic and acid, are bimodal. The volcanic rocks were formed in the extensional continental rift setting. 相似文献